After giving the musician the violin from his parents' home, he tells you where to find the doctor and that you should say hi to him at his house. I visited his house, and found his dead body there. Then, when I returned to the silo where you can talk to him, he was still there also, despite having died. I was able to talk to him and everything, and he still asked me to visit him in his house.

I don't know if this really counts as a bug, but it did seem to be something that shouldn't be in the game.